>I want to have a base converter for more digits than normal limit!
>
>For example, I want to converter a 64 digit Hexidecimal number into
>a Decimal Number or Inverse convertion, what can I do!?
>
>Suppose the function/procedure will like:
>
>myDecimal = chBase(myHexidecimal, OriginalBase, NewBase)
>
>where myDecimal, myHexidecimal are strings and
>OriginalBase, NewBase are integers.
>
>I donno the method to do!? May C, Basic or other language will do it easier!?

The problem is the internal representation of number - if you in fact need to represent 64 bit integer values, you'll need to use what is in C/C++ a ULARGE, which is a 64 bit integer type not available in VFP or VB AFAIK, stored and manipulated as two DWORDs. I'd suggest looking up "large integer Operation" in the MSDN for more details on ULARGE and the Win32 API functions associated with it.